It's always seemed to me that Poynting's Vector is the most aptly named
entity in mathematics.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Edward Mccann wrote on 4/7/2023 7:41 PM:
Dave:
You may have redefined Poynting’s Theorem!
Ed McCann
On Apr 7, 2023, at 6:23 PM, Dave New, N
Wait, shouldn’t the sensor be before the antenna tuner? I don’t think a sensor
should be connected where it’s not 50 ohms.
Al W6LX/4
> On Apr 7, 2023, at 9:22 PM, Dave New, N8SBE wrote:
>
> Alan,
>
> I tried changing the SensorCal entry, but you are correct there isn't enough
> range.
Dave:
You may have redefined Poynting’s Theorem!
Ed McCann
> On Apr 7, 2023, at 6:23 PM, Dave New, N8SBE wrote:
>
> Don,
>
> The KPA500 (and K3s) both show the correct wattage - 100W barefoot and about
> 26W out of the K3s when the KPA500 is inline, and about 500W out of the
> KPA500.
>
>
Don,
The KPA500 (and K3s) both show the correct wattage - 100W barefoot and
about 26W out of the K3s when the KPA500 is inline, and about 500W out
of the KPA500.
I tried changing the P3 SensorCal value from 500 (default) to 350 (min)
but that only dropped the wattage shown by a little less t
Alan,
I tried changing the SensorCal entry, but you are correct there isn't
enough range. It only cut the reading by less than half.
When I change the MtrScale entry, it changes the meter scale, but it
still shows over 800W (and runs over the smaller scales) in text on the
screen.
I did a
Dave,
Yes, it is at 500 which is the default, and I've used it at the setting
for the past 13 years.
I tried changing it to 350 which is the minimum, and it now shows about
440W, so that seems about right for 350/500 * 873W.
But it seems there isn't enough range to pull it in to 100W, so I don
Hi Dave,
There is a "SensorCal" entry in the Transmit Monitor Menu, but I don't
think it has enough range to correct such a large error.
There is also a "MtrScale" entry to set the full-scale power on the
meter display. Does the reading change when you change the scale?
In addition to the
Dave,
What power is displayed on the KPA500? The KPA500 would fault if indeed
the K3s is putting out that much power. The KPA500 power bar is pretty
accurate, just a bit coarse in its increments.
I think a power calibration is in order for the P3 power indicator.
73,
Don W3FPR
On 4/7/2023
Have you looked at the calibration setting in it yet? Not sure if it
can pull it that far, but that may be what is off.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 4/7/23 11:12,
So, I was the guy that had a P3 display/boot problem recently.
I sent it to the mother ship for repair, and they found that (get this)
the 12V supply was shorted to the 3.3V supply (eep!).
So, a new(er) I/O board (which contains the supplies) and a replacement
blown 3.3V LCD controller later, I
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